WOODSIDE, California -- Koko the gorilla passed away Tuesday morning in her sleep at the age of 46. Koko was known for her extraordinary mastery of sign language. Koko was born at the San Francisco ...

WOODSIDE, Calif. -- Koko the gorilla passed away Tuesday morning in her sleep at the age of 46. She was known for her extraordinary mastery of sign language. Koko was born at the San Francisco Zoo and ...

WOODSIDE, Calif. -- Koko the gorilla passed away Tuesday morning in her sleep at the age of 46. Koko was known for her extraordinary mastery of sign language. Koko was born at the San Francisco Zoo ...

WOODSIDE, Calif. -- Koko, the gorilla who mastered sign language, has died. The Gorilla Foundation says the 46-year-old western lowland gorilla died in her sleep at the foundation's preserve in ...